#include <iostream>
#include <cstring>
#include <functional>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>

#include "Log.hpp"
using namespace log_ns;

int main(int argc, char *argv[])
{
  if (argc != 3)
  {
    std::cerr << "Usage: " << argv[0] << " server-ip server-port" << std::endl;
    exit(0);
  }

  std::string serverip = argv[1];
  uint16_t serverport = std::stoi(argv[2]);
  // 1.创建socket
  int sockfd = ::socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0)
  {
    std::cerr << "create socket error" << std::endl;
    exit(1);
  }
  // 2.不需要显示的bind，但是一定要有自己的IP和port，所以需要隐式的bind，OS会自动bind sockfd，用自己的IP和随机算口号
  // 什么时候进行自动bind,if the connection or binding succeeds
  struct sockaddr_in server;
  memset(&server, 0, sizeof(server));
  server.sin_family = AF_INET;
  server.sin_port = htons(serverport);
  // server.sin_addr.s_addr =
  // 进程序列转为网络序列
  ::inet_pton(AF_INET, serverip.c_str(), &server.sin_addr);

  int n = ::connect(sockfd, (struct sockaddr *)&server, sizeof(server));
  if(n < 0)
  {
    //连接失败
    std::cerr << "connect socket error" <<std::endl;
    exit(2);
  }

  while(true)
  {
    std::string message;
    std::cout << "Enter # ";
    std::getline(std::cin, message);
    //将消息发给服务器
    write(sockfd, message.c_str(), message.size());

    char echo_buffer[1024];
    //读取服务端返回的消息
    int n = read(sockfd, echo_buffer, sizeof(echo_buffer));
    if(n > 0)
    {
      echo_buffer[n] = '\0';
      std::cout << echo_buffer <<std::endl;
    }
    else
    {
      break;
    }
  }


  ::close(sockfd);
  return 0;
}